linux-kernel - Re: ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko] undefined!

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Message-ID: <Z3CyoSB2hTDyGz7R@rli9-mobl>
Date: Sun, 29 Dec 2024 10:23:29 +0800
From: Philip Li <philip.li@...el.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
CC: kernel test robot <lkp@...el.com>, Andrew Lunn <andrew@...n.ch>,
	<oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-mips@...r.kernel.org>
Subject: Re: ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko]
 undefined!

On Sat, Dec 28, 2024 at 02:55:02PM +0100, Geert Uytterhoeven wrote:
> On Sat, Dec 28, 2024 at 2:50 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > Hi Kernel Test Robot,
> >
> > On Sat, Dec 28, 2024 at 2:36 PM kernel test robot <lkp@...el.com> wrote:
> > > First bad commit (maybe != root cause):
> > >
> > > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head:   fd0584d220fe285dc45be43eede55df89ad6a3d9
> > > commit: a9770eac511ad82390b9f4a3c1728e078c387ac7 net: mdio: Move MDIO drivers into a new subdirectory
> > > date:   4 years, 4 months ago
> > > config: sh-randconfig-001-20241212 (https://download.01.org/0day-ci/archive/20241228/202412282326.0DSE4HbR-lkp@intel.com/config)
> > > compiler: sh4-linux-gcc (GCC) 12.4.0
> > > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241228/202412282326.0DSE4HbR-lkp@intel.com/reproduce)
> > >
> > > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > > the same patch/commit), kindly add following tags
> > > | Reported-by: kernel test robot <lkp@...el.com>
> > > | Closes: https://lore.kernel.org/oe-kbuild-all/202412282326.0DSE4HbR-lkp@intel.com/
> > >
> > > All errors (new ones prefixed by >>, old ones prefixed by <<):
> > >
> > > >> ERROR: modpost: "__delay" [drivers/net/mdio/mdio-cavium.ko] undefined!
> >
> > The real issue was introduced in commit 1eefee901fca0208
> > ("phy: mdio-octeon: Refactor into two files/modules").
> 
> Silly me: commit 2fd46f47be0f96be
> ("netdev: mdio-octeon.c: Convert to use device tree.").
> But even before that, the driver used a different non-portable construct.
> 
> > Drivers must not use __delay() directly, as that is non-portable, and
> > doesn't work in the presence of cpufreq.
> 
> And looking at
> https://lore.kernel.org/all/202412282326.0DSE4HbR-lkp@intel.com
> all of this has been said before...

Sorry Geert about the false report that costs your effort to check, we should
avoid reporting against this commit after that discussion. I will fix it asap.

> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>